If you're booting Knoppix from the USB device then I don't think that you can fix it with a change to knoppix.sh.
You have to edit linuxrc and burn a new CD.
Look for these two lines:
Code:
FOUNDUSB=""
for i in usb-uhci.o usb-ohci.o; do
and change the second line to:
Code:
for i in ehci-hcd.o usb-uhci.o usb-ohci.o; do
I loaded Knoppix onto my 1GB CompactFlash card and once I included the above fix in linuxrc it ran nearly three times faster.

Pete